Something that I'd like to share with you!

Thursday, August 05, 2010

YUI Compressor with GUI

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Minification is the process of removing all unnecessary characters from source code such as
white space characters, new line characters, comments and block delimiters
without changing its functionality. [read more...]

Minified code reduces the amount of data that needs to be transferred through the web server (bandwidth saving).
It may also be used as a kind of obfuscation.

My favorite minification tool is YUI Compressor.
Mostly for CSS (Cascading Style Sheets) and JS (JavaScript).

Let us taka a look what happen when a simple code get minified.

JavaScript - Original Code

function startTime(){
    var today=new Date();
    var h=today.getHours();
    var m=today.getMinutes();
    var s=today.getSeconds();
    // add a zero in front of numbers<10

function checkTime(i){
    if (i<10){
        i="0" + i;
    return i;
JavaScript - Minified
function startTime(){var b=new Date();var d=b.getHours();
var a=b.getMinutes();var c=b.getSeconds();a=checkTime(a);
t=setTimeout("startTime()",500)}function checkTime(a){if(a<10){a="0"+a
}return a};
CSS - Original Code
    font-family:"Times New Roman";
CSS - Minfied
p{font-family:"Times New Roman";font-size:20px;}
Just to share here, since YUI Compressor don't provide any GUI, I've created one with Java Swing. It has been compiled together with yuicompressor-2.4.2.jar.
You need to have Java installed in order to run this executable JAR.

Download (MD5 : 210176c93d331c50dc19a2dda0ae1c89 JsCssMin.jar)

Using logrotate to rotate and archive log

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Previously I found out that rotatelogs cannot replace the rotated logs, I try to find other option.

I always come across logrotate whenever trying to search for rotatelogs.

So I give them a try.

1st step is to find it. BTW, I'm on SuSE Linux Enterprise 10.

$ logrotate
-ksh: logrotate: not found [No such file or directory]

Since it is not in the path, try to find it by doing this.

$ whereis logrotate
logrotate: /usr/sbin/logrotate /etc/logrotate.d /etc/logrotate.conf /usr/share/man/man8/logrotate.8.gz

Now try to run it with full path.

$ /usr/sbin/logrotate

Again, an error occurs.

error: error creating state file /var/lib/logrotate.status: Permission denied

This is because the user that we are currently on don't have write access /var/lib/logrotate.status.

-rw-r--r--  1 root   root  1246 2010-07-28 09:30 logrotate.status

Ask help from system root to change it...

# chmod 666 logrotate.status


-rw-rw-rw-  1 root   root  1246 2010-07-28 09:30 logrotate.status

So, now try again.

$ /usr/sbin/logrotate
logrotate 3.7.3 - Copyright (C) 1995-2001 Red Hat, Inc.
This may be freely redistributed under the terms of the GNU Public License

Usage: logrotate [-dfv?] [-d|--debug] [-f|--force] [-m|--mail command]
[-s|--state statefile] [-v|--verbose] [-?|--help] [--usage]

At last. Now create a simple conf like below.

$ cat ./logrotate.conf
/home/username/test/mylog {
rotate 5

From my observation by triggering it manually (based on configuration above), I found out that it start by compressing the log file and name it mylog.1.gz.
When I trigger it again, it will rename the mylog.1.gz to mylog.2.gz and create a new mylog.1.gz. It will continue to do that but will not exceed mylog.5.gz (rotate 5 from conf file).

-rw-r--r-- 1 user group  348 2010-07-28 15:32 mylog
-rw-r--r-- 1 user group   54 2010-07-28 15:32 mylog.1.gz
-rw-r--r-- 1 user group   59 2010-07-28 15:32 mylog.2.gz
-rw-r--r-- 1 user group   58 2010-07-28 15:32 mylog.3.gz
-rw-r--r-- 1 user group   51 2010-07-28 15:32 mylog.4.gz
-rw-r--r-- 1 user group   57 2010-07-28 15:32 mylog.5.gz

This is just like what I wanted. It will keep only 5 gz files. Now you can schedule (cron) them accordingly.